Problems eating

Laura
So I'm 17 weeks today and I feel bad because I haven't gained much (if any) weight, I'm not hungry, and I can't eat a lot in one sitting. For example-I had a bowl of left over Japanesse and I know I need to eat, but I'm not hungry at all. Should I be worried? I'm only neasuated once in a while and it's usually in the mornings.